Cox came out today and verified that one of two things is causing my internet speeds to be slow:

1.) They have a usage issue (too many people tied to one main line)

2.) The main line in my area is bad.

He said they will resolve the issue as soon as possible by either adding additional capacity or replacing any damaged lines. Hopefully that won't take too terribly long!

I did find out one thing while the technician was here trouble shooting things: I no longer need the ground isolator installed (No more ep500 humming without it!) He said the isolator was introducing noise into the system. I just had a new cable line run to my house from the main box so I assume that is what stopped the hum (or the new ep500 amp I got stopped it, not sure.)

-David